<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title>Test Request Animation Frame</title>
    <meta name="viewport" content="width=device-width, initial-scale=1" />
</head>
<body style="margin:0">
    <canvas id="canvas-1" width="100%" height="100%"></canvas>
    <script type="text/javascript">
        // Test requestAnimationFrame
        let instance=document.querySelector("#canvas-1");
        let ctx=instance.getContext("2d");
        console.log(ctx);
        
    </script>
</body>
</html>